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应用科学学报 ›› 1993, Vol. 11 ›› Issue (3): 277-282.

• 论文 • 上一篇    

二乙胺在沸石分子筛上的吸脱附行为研究

段雪, 朱娅玲, 王作新   

  1. 北京化工学院
  • 收稿日期:1991-07-29 修回日期:1991-12-31 出版日期:1993-09-30 发布日期:1993-09-30
  • 基金资助:

    国家自然科学基金资助项目

DYNAMIC STUDIES FOR ADSORPTION AND DESORPTION OF(C2H5)2NH ON DIFFERENT ZEOLITES BY TPD

DUAN XUE, ZHU YALING, WANG ZHOUXIN   

  1. Beijing Institute of Chemical Technology
  • Received:1991-07-29 Revised:1991-12-31 Online:1993-09-30 Published:1993-09-30

PDF

118

被引次数

2

摘要：

以程序升温脱附(TPD)为主要实验手段,对二乙胺在5种不同沸石分子筛上的吸脱附行为进行了研究 结果表明:沸石分子筛对二乙胺有着较强的吸附作用,但不同的沸石分子筛对二乙胺的吸附能力受其结构和表面酸性特征的影响而有所不同;适用于交联条件的有效吸附部位为一与沸石分子筛表面酸性有关的弱化学吸附位;二乙胺从不同沸石分子筛表面脱附的动力学与晶内扩散有关,其表观脱附活化能分别为:75.4kJ/mol(5A)、51.5kJ/mol(13X)、23.2kJ/mol(菱沸石)、35.6kJ/mol(NaY)和56.9kJ/mol(ZSM-5).

关键词: 脱附, 分子筛, 交联剂, 程序, 升温

Abstract:

In this paper, the adsorption and desorption of (C2H5)2NH, as a cross linked agent, on different zeolites are studied by temperature programmed desorption (TPD). It is shown that (C2H3)2NH can be strongly adsorbed on the surface of the zeolites and the capabilities of the adsorption are different when the acid characteristics on the surface of the zeolites are different. The effective sites of adsorption for the cross linked agent, are the sites of weak chemical adsorption. By kinetic calculation, it is found that there is a crystal diffusion in the desorption and the apparent activation energies of the desorption are 75.4kJ/mol(for5A), 51.5kJ/mol(for 13X), 23.2kJ/mol(for a nature zeolites), 35.6kJ/mol(for NaY) and 56.9kJ/mol(for ZSM-5).

Key words: desorption, temperature programing, zeolite, cross linking agent